Tektronix 556 Instruction Manual page 162

Calibration— Type 556
display when rotating the dial from 1.00 to 9.00. Check
dial reading from 9.00 at intercept point. For the 0.5 /iSEC
switch position, set the A Triggering SOURCE switch to RIGHT
INT NORM, the Lower Beam DISPLAY MAG switch to X I and
use a similar technique to that described in steps 49c through
49f.
For the A TIME/CM switch position from 1 /iSEC to 5 SEC,
use a similar technique for checking delaying sweep accuracy
to that used when setting up the Delay Start and Stop adjust­
ments (step 46) and as shown in Fig. 6-43.
TABLE 6 -3
Timing and D elaying Sweep Accuracy— A Sweep
A TIM E /C M B TIM E /C M
0.1 /iSEC3 0.1 /iSEC4
0.2 i i SEC 0.1 /iSEC4
0.5 /iSEC5 0.1 /iSEC
1 /iSEC3 0.1 /iSEC
2 /iSEC 0.2 /iSEC
5 /iSEC 0.5 /iSEC
10 /iSEC3 1 /iSEC
20 /iSEC 2 /iSEC
50 /iSEC 5 /iSEC
10 /iSEC
0.1 mSEC
0.2 mSEC 20 /iSEC
0.5 mSEC 50 /iSEC
1 mSEC3 0.1 mSEC
2 mSEC 0.2 mSEC
5 mSEC 0.5 mSEC
10 mSEC 1 mSEC
20 mSEC 2 mSEC
5 mSEC
50 mSEC
0.1 SEC 10 mSEC
0.2 SEC 20 mSEC
0.5 SEC 50 mSEC
1 SEC
0.1 SEC
0.2 SEC
2 SEC
5 SEC 0.5 SEC
JUse CONTRAST control to check display.
P reviously adjusted.
4Lower Beam DISPLAY M AG switch is set to X 10-
B TIM E /C M switch positions, the switch is set to X l < )
P reviou sly adjusted. Set the A Triggering SOURCE switch to RIGHT
INT NORM and the MODE switch to TRIG.
52. Adjust Timing— B Sweep
a. Set the Type 556 and plug-in controls as follows:
A Triggering Controls
SOURCE
COUPLING
SLOPE
MODE
LEVEL
6 -4 4
Check Upper
Beam
Time M ark
G e nerator D isplay"
1 marker/cm
0.1 /is
2 markers/cm
0.1 /is
1 marker/cm
0.5 /is
1 /iS 1 marker/cm
2 markers/cm
1 /is
1 marker/cm
5 /is
1 marker/cm
1 0 /is
2 markers/cm
10 /is
1 marker/cm
50 /is
1 marker/cm
0.1 ms
2 markers/cm
0.1 ms
1 marker/cm
0.5 ms
1 marker/cm
1 ms
2 markers/cm
1 ms
1 marker/cm
5 ms
1 marker/cm
10 ms
10 ms 2 markers/cm
1 marker/cm
50 ms
1 marker/cm
0.1 s
0.1 s 2 markers/cm
0.5 s 1 marker/cm
1 s
1 marker/cm
1 s 2 markers/cm
1 marker/cm
5 s
I For the rem aining
O
RIGHT INT NORM
AC
+
TRIG
Fully clockwise, knob
pushed in
Upper Beam DISPLAY
Upper Beam DISPLAY MAG
A TIME/CM
A VARIABLE
A MODE
B Triggering Controls
SOURCE
COUPLING
SLOPE
MODE
LEVEL
Lower Beam DISPLAY
Lower Beam DISPLAY MAG
B TIME/CM
B VARIABLE
B MODE
Test Load Unit (both)
Test Function
b. Set the time mark generator for 10-microsecond markers.
c. Position the Lower Beam display so the markers coincide
with the graticule lines.
d. Check— One marker/cm, Lower Beam display.
e. Adjust C860G (see Fig. 6-49) to obtain 1 marker/cm.
f. Change the B TIME/CM switch to 1 /iSEC.
g. Set the time-mark generator for 1-microsecond markers.
h. Check— One marker/cm. Lower Beam display.
i. Adjust C860H (see Fig. 6-49) to obtain 1 marker/cm.
j. Change the B TIME/CM switch to 0.5 /tSEC.
k. Check— One m arker/2cm . Lower Beam display.
. Adjust C860J (see Fig. 6-49) for one marker per 2 cm.
l
m. Change the B TIME/CM to 0.1 /tSEC.
n. Set the time-mark generator for 0.1 -microsecond markers.
o. Remove the 10 /iSEC trigger signal from the Upper Beam
TRIGGER INPUT connector and apply the signal to the Lower
Beam TRIGGER INPUT connector.
p. Set the B Triggering SOURCE switch to RIGHT EXT.
q. Check— One marker/cm, Lower Beam display.
r. Adjust C881 (see Fig. 6-50) to obtain one marker/cm.
s. Interaction— C881 and C860J adjustments interact; set
the time-mark generator for 1-microsecond markers and repeat
steps (j) through (r) until no further adjustment is necessary.
53. Adjust C882— B Sweep Crossover
Compensation
a. Change the Upper Beam DISPLAY switch to RIGHT
PLUG-IN B.
RIGHT PLUG-IN A
X I
1 mSEC
CALIBRATED
NORM
RIGHT INT NORM
AC
+
AUTO STABILITY
Near 0, knob pushed in
RIGHT PLUG-IN B
X I
1 0 /iSEC
CALIBRATED
NORM
Low Load
O
< B >